(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Children's Library | Biodiversity Heritage Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "The manufacture and properties of iron and steel"

336
METALLUHGY OP IRON AND STEEL.
alone. This is done in Table XVI-S. It may be noticed that there are '41 bars running between 10 and 12 feet in length, while in Table XVI-R there are only 18 of this size. This arises from the fact that there were a few of this length in each of the groups as classified by section, but they were not in sufficient number to be of value for comparison, except in Group 13 (see Table XVI-E)/ In Table XVI-S these scattering bars are combined with Group 13 to have a larger number in the average. The results are plotted in Fig. XVI-B, which shows the law of elongation in long bars. A further point is the proportion of bars that fall below a, given standard, since an average may be made up of widely different kinds of metal, or it may be made from a uniform product. . Table XVI-T gives an analysis of the records showing the number and percentage of bars in each division which give less than the standard percentage of elongation.
The number of rejections on longer lengths is fully as great as
TABLE XVI-U. Alteration in Physical Properties by Eest after Eolling.*
		Hand rounds.						Guide Bounds.					
		»						a					
		C8  .		Alteration. Galn= +				l-d		Alteration.   Gain =» +			
	..	"o-S		Loss= —				v®		Loss —			
	i go	6 *						Is					
	K a												
	» »i •w et	-u 09 £	QQ		g	".	*<6	.13 n 2	00 £	s	'A	43	..
&	083 d ts>	09	s			a oo«	§	oa	S		Wig,	00 $	§
&		A	X)	+**A		•Sfc	o9 •H	A	A	•*3 IM	fl£	at:	4
VI 0	»ft ..	<* H	a	1ft§	">ft§	&•	O a^	H	a	a S.		ap,	aj
I fc	o-a "S 1'	Less thai	More tha	Elastic 1 pounds square	Ultimate pounds square	•W 00 0 o o a W^	Beductio per cen	Less thai	More tha	S 00 isJ s •	'-3 ® 0	i»l*H	Beductio per cen
I	55000"to 60000							6	10	+719	+487	+.65	+ .98
II	60000 to 65000	10	6	—1207	+385	+1.11	+2.14	10	22	—453	+596	+.78	+1.13
III IV	66000 to 70000 70000 to 76000	82 21	12 20	— 471 + 802	—180 +197	— .25 + .66	+ 2.07 + 2.95	22 24	X	—170 —166	+882 +688	+.83 +.44	+1.45 +1.14
V	75000 to 80000	10	8	— 809	+107	+1.06	+6.76	85	47	—814	+201	-.81	+2.83
VI VII	80000 to 85000 85000 to 90000	7	8	+ 213	+ 86	+ .29	+ .44	8	80 16	—165 + 92	+767 +525	+.42 +.46	+1.24 + .62
AT.	of all tests.	80.	48	— 894	+109	+ .56	+2.87	121	197	—270	+507	+.82	+ .99
* Notes on Results Obtained from Steel Tested Shortly after Rolling.   Amer. Soc. Mech. Eng., Vol. IX, p. 38.